Raman phonon anomalies in Sr(Fe1-xCox)2As2

doi:10.1088/1674-1056/ac0cd6

中国物理B ›› 2022, Vol. 31 ›› Issue (2): 27401-027401.doi: 10.1088/1674-1056/ac0cd6

Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂

Yanxing Yang(杨彦兴)^1,2,†, Hewei Zhang(张鹤巍)², and Haizheng Zhuang(庄海正)²

1 School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, China;
2 Department of Physics, New Jersey Institute of Technology, Newark 07102-1982, USA

收稿日期:2021-05-20 修回日期:2021-06-18 接受日期:2021-06-21 出版日期:2022-01-13 发布日期:2022-01-22
通讯作者: Yanxing Yang E-mail:yy397@njit.edu

Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂

Yanxing Yang(杨彦兴)^1,2,†, Hewei Zhang(张鹤巍)², and Haizheng Zhuang(庄海正)²

1 School of Physics, Communication and Electronics, Jiangxi Normal University, Nanchang 330022, China;
2 Department of Physics, New Jersey Institute of Technology, Newark 07102-1982, USA

Received:2021-05-20 Revised:2021-06-18 Accepted:2021-06-21 Online:2022-01-13 Published:2022-01-22
Contact: Yanxing Yang E-mail:yy397@njit.edu

摘要/Abstract

摘要： Phonon anomalies have been reported in iron-pnictide superconductors indicating a diverse interplay between different orders in the materials. Here, we report Raman scattering measurements on Sr(Fe_1-xCo_x)₂As₂ (x=0 and x=0.04) single crystals in the B_2g symmetry with respect to a 1 Fe unit cell. Upon cooling, we observe a larger split (13 cm^-1) of E_g Raman phonon modes pertaining to in-plane Fe and As displacements as the crystals undergo the tetragonal-to-orthorhombic structural phase transition, although a considerable split (9 cm^-1) has been reported in Ba(Fe_1-xCo_x)₂As₂. Furthermore, the splitting of E_g phonon modes is strongly reduced upon doping. We perform an order-parameter analysis revealing a similar doping dependence of E_g phonon splitting as reported in other compounds of the 122 family, indicating these phonon anomalies widely exist in 122 iron-based superconductors and might share the same mechanisms.

关键词: Raman scattering, superconductor, phonon, phase transition

Abstract: Phonon anomalies have been reported in iron-pnictide superconductors indicating a diverse interplay between different orders in the materials. Here, we report Raman scattering measurements on Sr(Fe_1-xCo_x)₂As₂ (x=0 and x=0.04) single crystals in the B_2g symmetry with respect to a 1 Fe unit cell. Upon cooling, we observe a larger split (13 cm^-1) of E_g Raman phonon modes pertaining to in-plane Fe and As displacements as the crystals undergo the tetragonal-to-orthorhombic structural phase transition, although a considerable split (9 cm^-1) has been reported in Ba(Fe_1-xCo_x)₂As₂. Furthermore, the splitting of E_g phonon modes is strongly reduced upon doping. We perform an order-parameter analysis revealing a similar doping dependence of E_g phonon splitting as reported in other compounds of the 122 family, indicating these phonon anomalies widely exist in 122 iron-based superconductors and might share the same mechanisms.

Key words: Raman scattering, superconductor, phonon, phase transition

中图分类号: (Optical properties)

74.25.Gz

74.25.Kc (Phonons) 78.30.-j (Infrared and Raman spectra) 74.62.Dh (Effects of crystal defects, doping and substitution)

Yanxing Yang(杨彦兴), Hewei Zhang(张鹤巍), and Haizheng Zhuang(庄海正). Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂[J]. 中国物理B, 2022, 31(2): 27401-027401.

Yanxing Yang(杨彦兴), Hewei Zhang(张鹤巍), and Haizheng Zhuang(庄海正). Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂[J]. Chin. Phys. B, 2022, 31(2): 27401-027401.

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Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂

Raman phonon anomalies in Sr(Fe_1-xCo_x)₂As₂

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